The US ambassador to NATO said China needed to be “called out for their subsidizing” of Russia’s war in Ukraine as the Trump administration ratchets up its threat to impose tariffs if Moscow does not agree to a peace deal.

Last week, the president of the United States allowed the transfer of a number of American Patriot anti-missile systems through Germany—a move that will strengthen Ukraine’s air defense at a dangerous...

Russia has demanded that Ukraine give up four regions, on top of Crimea, which it annexed in 2014.